Expression 2: "r" left parenthesis, "z" , right parenthesis equals StartRoot, "z" .real squared minus "z" .imag squared , EndRootrz=z.real2−z.imag2
2
Expression 3: "r" left parenthesis, "f" left parenthesis, 0 , 22 , "x" plus "y" "i" , right parenthesis , right parenthesis less than or equal to 2rf0,22,x+yi≤2
3
Expression 4: "f" left parenthesis, "z" , "n" , "c" , right parenthesis equals "a" left parenthesis, "f" left parenthesis, "z" , "n" minus 1 , "c" , right parenthesis , "c" , right parenthesis with "f" left parenthesis, "z" , 0 , "c" , right parenthesis equals 1 minus 1fz,n,c=afz,n−1,c,cwithfz,0,c=1−1